Port plug for respiratory mask



FIG. 1 is a perspective view of a port plug for a respiratory mask according to an embodiment of my design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;and

FIG. 7 is a bottom view thereof. 

The ornamental design for a port plug for respiratory mask, as shown and described. 